%
% x1 - x2
% Performs a fuzzy subtraction operation on two interval-represented (thus convex) sets
% The intervals that comprise the sets must have identical intrinsic alphas or you get junk,
% though it is agnostic to the actual alpha values
%
function y = fuzzy_subtract(x1, x2);

y(:,1) = x1(:,1) - x2(:,2);
y(:,2) = x1(:,2) - x2(:,1);
